DEEP: Eastern Pondmussel

Eastern Pondmussel
Ligumia nasuta

Special Concern
{External shell of Eastern Pondmussel}
External Shell
{Internal shell, right valve of Eastern Pondmussel}
Internal shell, right valve
{Hinge teeth of Eastern Pondmussel}
Hinge teeth
Key Features
Size: Up to six inches.
Shape: Narrow and elongate, tapering to a blunt point posteriorly. Females are often distinctly more rounded along the posterior ventral margin. Valves laterally compressed, thin, and strong.
Periostracum: Color yellowish or greenish-black (juveniles) to dark brown or black (adults). Shell rays are often only visible in juveniles or light-colored adults.
Lateral Teeth: Present but delicate. Two on the left valve and one on the right valve.
Pseudocardinal Teeth: Present but delicate. One or two on both the left valve and right valve.
Nacre: Color usually silvery-white, pinkish, or purple.

Often Confused With...
Not easily confused with any other species in Connecticut, although the eastern pearlshell may have a similar elongate shape.

The eastern pondmussel inhabits a variety of habitats such as coastal ponds, streams, and rivers.

{Range map of Eastern Pondmussel} Range in Connecticut
Known from the Connecticut River watershed and south-central coastal watersheds.

The eastern pondmussel is listed as special concern in Connecticut. Many of its historic populations are thought to be extirpated or in decline, and there are few remaining populations that are considered healthy and stable. Environmental pollution and habitat degradation are considered the primary reasons for its decline. It is also listed as special concern in Massachusetts.

The Freshwater Mussels of Connecticut